$-4\left(-2\right)^2\:\left(-1\right)+2\left(-2\right)\left(-1\right)^2\:+3$
$6k\:x\:7k$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)^2}{x^2}\right)$
$\frac{x^2-2x+4}{x-6}$
$a^2bc+2ab^2c+4abc^2-5ab^2c+6a^2bc-7abc^2$
$\int e^{7x+5}dx$
$-x^2+x-48=0$
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